– An 8-port expansion module supporting FXS and DID (part number EM3-HDA-8FXS/DID)

– A 6-port expansion module supporting FXO (part number EM-HDA-6FXO)

– A 7-port expansion module with 3 FXS and 4 FXO ports (part number EM-HDA-3FXS/4FXO)Adding expansion modules to the Cisco High-Density Extension Module baseboard increases voice and fax session capacity. The modular design of the Cisco High-Density Extension Module provides maximum flexibility-plug in up to two expansion modules in any combination to build the Cisco High-Density Extension Module best suited for specific packet telephony network locations.

The Cisco High-Density Extension Module provides gateway services for Cisco Unified Communications using Cisco Unified Communications Manager with Survivable Remote Site Telephony (SRST) or Cisco Unified Communications Manager Express (UCME). Gateway services allow users to deploy networks that take advantage of investments in existing legacy telephony equipment while also deploying and integrating IP telephony. The network can operate at any point on the voice, video and integrated data spectrum-with the ability to add connections for both traditional telephony devices and IP telephony endpoints.